condition mean min max ZT0-3 0.4845085 0.4845085 0.4845085 ZT4-7 0.339281 0.339281 0.339281 ZT8-11 0.6884224999999999 0.6884224999999999 0.6884224999999999 ZT12-15 0.9645375 0.9645375 0.9645375 ZT16-19 0.8096485 0.8096485 0.8096485 ZT20-23 0.577326 0.577326 0.577326